MacOS查看JDK版本或卸载

1. 查看当前配置的JDK版本

   java -version 
   java version "1.8.0_211"
   Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
   Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)

2. 查看已安装的JDK版本

    /usr/libexec/java_home -V
    # 输出
    Matching Java Virtual Machines (5):
   21.0.1 (x86_64) "Oracle Corporation" - "Java SE 21.0.1" /Library/Java/JavaVirtualMachines/jdk-21.jdk/Contents/Home
   17.0.9 (x86_64) "Oracle Corporation" - "Java SE 17.0.9" /Library/Java/JavaVirtualMachines/jdk-17.jdk/Contents/Home
   11.0.21 (x86_64) "Oracle Corporation" - "Java SE 11.0.21" /Library/Java/JavaVirtualMachines/jdk-11.jdk/Contents/Home
   1.8.211.12 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
   1.8.0_211 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_211.jdk/Contents/Home

3. 删除JDK

   # 进入指定目录
   cd /Library/Java/JavaVirtualMachines
   # 删除
   sudo rm -rf <要删除的目录>

4. 清除环境变量
   若要配置新的JDK，需要修改 bash_profile 文件环境变量，然后 source .bash_profile使其生效。